[AquaticLife] Prepping Tank for Betta
Do a Google Image search of “Hartz 50 watt heater” and see if you can find yours. It’s probably a newer model submersible since I’m not sure Hartz products are built to last a long time. 
You might want to keep a very close eye on it and plan to replace the heater since it’s failure could be catastrophic.
I have an article on my blog based on an experiment I did with mimicking a faulty 50W heater on a 10G tank…. mimicking failure with it stuck in the off position and on position and the temperature swings are rather dramatic.. With incandescent lighting, you may not even need a heater when the lights are on but it would be needed when the lights are off. If you replace it one day, you could probably go with a 25W heater… or if you really want to err on the side of caution, go with two 25W heaters. I talk about this redundancy concept in my article. A 25W heater, stuck in the on position would not be able to heat up your tank as fast or as high, compared to a 50W heater. With two 25W heaters, if one should fail in the off position, the other would still keep the water stabile. If one should fail in the on position, it wouldn’t be able to cook your fish. It’s unlikely both would fail at the same time. You would notice if the little pilot light was on all the time to indicate a possible problem.
I also use those little stick on thermometers on the sides of my tanks which tell me at a glance what the water temp range is like.
Lenny Vasbinder Fish Blog - http://GoldLenny.blogspot.com
Category: Philippines Internet Koi Society
